Why would a patient be on blood thinner for high heart rate?

Not for heart rate. Blood thinners don't really affect heart rate. Drugs like Coumadin (warfarin) (a powerful blood thinner) would be given to someone with a high risk of blood clots. Certain heart rhythm problems are significant risk factors for getting blood clots. Aspirin is also a blood thinner and is used to prevent heart attacks. The blood thinners are probably being given for one of these reasons.
Stroke prevention. The fast heart rate is probably a consequence of irregular heart beats coming from the top chambers (atrial fibrillation or atrial flutter). These conditions can lead to formation of blood clots inside the heart that can lead to strokes. As such, blood thinners are used to prevent it.

Related Questions

Afib 3 days. No prior history. High heart rate & BP while hospitalized. Cardiolgst said didnt nd blood thinner bt risk of clot/stroke has me worried?

You calculate risk. You can calculate your own risk: http://www.mdcalc.com/cha2ds2-vasc-score-for-atrial-fibrillation-stroke-risk/ I suspect, because you're so young and male, that you'll find your risk is too low to justify anticoagulation. Remember, thinning your blood carries risk too, so your doctor balances one risk against the other. Read more...

Would a high heart rate cause false reading on an electronic blood pressure machine?

Heart rate. High heart rate is unlikely to cause a false high reading but might cause a lower reading because of small stroke volume with tachycardia. Chronic blood pressure evaluation should be done with resting heart rate and equilibrium status. Read more...

I have high heart rate and normal blood pressure, what to do?

High heart rate. Need to know what is your heart rate? If it is more than normal range then need any ekg to see any arrhythmias. If it is sinus tachycardia, it could be from anxiety or pain or hyperthyroidism or hypovolemia or fever etc. Consult your physician. Read more...

What does it mean when you have low blood pressure but a high heart rate?

Need evaluation. Elevation in heart rate can be a compensatory change in the setting of low blood pressures. Cause cannot be determined without knowning the actual readings and without a thorough evaluation. Read more...